Lions RB Zach Zenner injures chest versus Bears

DETROIT, MI - AUGUST 13: Running Back Zach Zenner #34 of the Detroit Lions has a long gain against the New York Jets at Ford Field on August 13, 2015 in Detroit, Michigan. (Photo by Al Pereira/Getty Images for New York Jets)

Detroit Lions running back Zach Zenner was injured during the first half of Sunday's divisional showdown with the Chicago Bears. He went into the locker room with a chest injury, according to Brad Biggs of the Chicago Tribune, and the Lions gave him a "questionable" designation to return.

#Lions RB Zach Zenner has a chest injury and his return is questionable

Zenner has developed into a surprise contributor for the Lions this year. With starting running back Joique Bell out, the undrafted rookie has seen plenty of action. With Ameer Abdullah struggling to hold onto the ball last week, Zenner took over the majority of the ball-carrying duties.

If Abdullah starts fumbling again, the Lions will only have Theo Riddick left as a viable option at running back. Both Abdullah and Riddick are shifty backs with strong pass-catching abilities. Without Bell and Zenner, the Lions don't have a power back.